EP2538619A1 - Procédé destiné à la transmission de paquets de données - Google Patents

Procédé destiné à la transmission de paquets de données Download PDF

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Publication number
EP2538619A1
EP2538619A1 EP11170979A EP11170979A EP2538619A1 EP 2538619 A1 EP2538619 A1 EP 2538619A1 EP 11170979 A EP11170979 A EP 11170979A EP 11170979 A EP11170979 A EP 11170979A EP 2538619 A1 EP2538619 A1 EP 2538619A1
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EP
European Patent Office
Prior art keywords
data
data packet
transmission
transmitter
receiver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11170979A
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German (de)
English (en)
Other versions
EP2538619B1 (fr
Inventor
Franz-Josef GÖTZ
Günter Steindl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to ES11170979.6T priority Critical patent/ES2445718T3/es
Priority to EP11170979.6A priority patent/EP2538619B1/fr
Priority to US13/528,611 priority patent/US20120327950A1/en
Priority to CN2012102138341A priority patent/CN102843288A/zh
Publication of EP2538619A1 publication Critical patent/EP2538619A1/fr
Application granted granted Critical
Publication of EP2538619B1 publication Critical patent/EP2538619B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
    • H04L47/245—Traffic characterised by specific attributes, e.g. priority or QoS using preemption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40143—Bus networks involving priority mechanisms
    • H04L12/40163—Bus networks involving priority mechanisms by assigning priority to messages according to a message field
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/4026—Bus for use in automation systems

Definitions

  • the invention relates to a method for transmitting data packets in an Ethernet automation network, in particular to a method for transmitting data packets with different priorities.
  • the DE 10 2008 039 580 A1 discloses a method for transmitting data packets in a communication network, wherein first data packets with a low priority are transmitted between a sender and a receiver of the communication network, and wherein second data packets with a high priority over the first data packets are preferably transmitted between the sender and the receiver.
  • a second data packet to be transmitted by the transmitter to the receiver it is checked whether a first data packet is currently being transmitted. If the check of whether a first data packet is currently being transmitted is positive, the transmission of the first data packet is aborted or interrupted and the second data packet is subsequently transmitted thereto.
  • each first data packet is stored in a buffer in parallel to a transmission process and is deleted from the buffer only after a complete transmission of the first data packet to the receiver.
  • the invention relates to a method for transmitting data packets in an Ethernet automation network.
  • the data packages consist of several data frames.
  • a minimum size of the data frames is less than 64 bytes.
  • the minimum size of data frames in Ethernet networks, which are known from the prior art, is 64 bytes, since this minimum size collision detection in the Ethernet works.
  • Collision detection in Ethernet works according to the Carrier Sense Multiple Access / Collision Detection (CSMA / CD) method. For this, a minimum frame size of 64 bytes is required so that a sender can detect the collision of the transmitted frame with another frame and thus has information that this frame was not received correctly by the receiver.
  • CSMA / CD Carrier Sense Multiple Access / Collision Detection
  • a first data packet having a first priority is received by a transmitter.
  • the transmitter may be, for example, a network node, a router, a switch or a bridge.
  • a transmission of the first data packet from the transmitter to a receiver is started.
  • a second data packet with a second priority is received.
  • the second priority is higher than the first priority.
  • the second data packet is to be transmitted to the receiver.
  • the different priority levels indicate the importance of the data packet within the network. For example, real-time data has a relatively high priority or even the highest priority, while user data such as Internet data has a relatively low priority or even the lowest priority.
  • the sender receives information about how important a package is for the functioning of the automation network. For example, real-time data should be forwarded as quickly as possible because a delay can disrupt the automation process that is being performed by the automation network.
  • An automation network may e.g. be designed as an industrial automation network.
  • Such industrial automation networks may e.g. for the control and / or regulation of industrial installations (for example production plants, conveyor systems, etc.), machines and / or devices, which are designed and / or provided.
  • automation networks or industrial automation networks real-time communication protocols (eg Profinet, Profibus, Real-Time Ethernet) for communication at least between the components involved in the control and / or regulatory tasks (eg between the control units and the systems to be controlled and / or Machines).
  • the secure transmission of data via storage media is also covered.
  • At least one further communication protocol may also be provided in the automation network or industrial automation network, e.g. for monitoring, setting up, reprogramming and / or reparameterizing one or more control units in the automation network.
  • An automation network may e.g. Wired communication components and / or wireless communication components include.
  • an automation network may include at least one automation device.
  • An automation device can be, for example, a computer, PC and / or controller with control tasks or control capabilities.
  • an automation device for example, an industrial automation device be, for example, designed, equipped and / or provided specifically for the control and / or regulation of industrial equipment.
  • such automation devices or industrial automation devices can be real-time capable, ie enable real-time control or regulation.
  • the automation device or the industrial automation device for example, comprise a real-time operating system and / or at least support, inter alia, a real-time communication protocol for communication (eg Profinet, Profibus, Real-Time Ethernet).
  • An automation network includes multiple sensors and actuators.
  • the actuators and sensors are controlled by at least one control device.
  • the actuators, the sensors and the at least one control device exchange data with each other.
  • An automation protocol is used for data exchange.
  • the at least one controller controls the actuators, the sensors and the data exchange so that a machining process takes place in which e.g. a product is produced.
  • An industrial automation device may e.g. a programmable logic controller, a module or part of a programmable logic controller, be integrated in a computer or PC programmable logic controller and corresponding field devices, sensors and / or actuators, input and / or output devices or the like for connection to a programmable logic controller or include such.
  • any type of protocol is provided, which is provided for communication with automation devices according to the present description, suitable and / or set up.
  • Such automation protocols can be, for example, the Profibus protocol (eg according to IEC 61158 / EN50170), a Profibus-DP protocol, a Profibus-PA protocol, a Profinet protocol, a Profinet-IO protocol, a protocol in accordance with AS-Interface, a protocol in accordance with IO-Link, a KNX protocol, a protocol according to a multipoint interface (MPI), a protocol for a point-to-point connection (point-to-point connection).
  • MPI multipoint interface
  • PtP a protocol according to the specifications of the S7 communication (which is provided and set up, for example, for the communication of programmable logic controllers from Siemens) or an Industrial Ethernet protocol or real-time Ethernt protocol or more specific Be protocols for communication with automation devices.
  • S7 communication which is provided and set up, for example, for the communication of programmable logic controllers from Siemens
  • Industrial Ethernet protocol or real-time Ethernt protocol or more specific Be protocols for communication with automation devices.
  • any combination of the aforementioned protocols may be provided.
  • the transmitter aborts the transmission process of the first data packet within one of the data frames of the first data packet.
  • the transmission is aborted at the time the second data packet is received. It is therefore aborted the transmission of the data frame, which is at the time of receiving the second data packet in the transmission process. Thereafter, the transmission of the second data packet from the transmitter to the receiver.
  • the cancellation of the transmission process within a data frame has the advantage that the higher priority data is sent faster by the transmitter.
  • a data frame is always transmitted to the end. This results in a minimum size of the data frame of 64 bytes, as prescribed in the Ethernet, a delay of 5 microseconds at a transmission speed of 100 Mbit / s, if the transmission process of the data frame has just been started when the second data packet is received. If, for example, the second data packet now includes real-time data, this real-time data would be forwarded by the transmitter by 5 ⁇ s late. This delay is multiplied in each transmitter of the automation network. This results in a total delay of 5 ⁇ s per network node. This can lead to the real-time data being delayed too much and errors in the automation network.
  • the minimum size of the data frames is less than 64 bytes reduces this delay when sending the second data packet. For example, if a data frame consists of only 1 byte, the delay will drop to 80 ns for a data transfer rate of 100 Mbps. The minimum size of the data frames can be reduced to up to 1 byte. This 1 byte must not be underrun to avoid creating an alignment error.
  • the delay during the transmission of the second data packet drops to 40 ns at a speed of 100 Mbit / s. In this case, only the last nibble has to be sent. A nibble is half a byte, that is 4 bits. An entire byte does not have to be transmitted here because an alignment error has no significant effect.
  • the aborted data frame is discarded at the receiver as well. In this case, the alignment error caused by aborting the data frame without sending the last full byte becomes unimportant. The aborted data frame must then be retransmitted when the second data packet has been transmitted. If a part of the aborted data frame has already been received by the receiver, it will be discarded in the receiver.
  • RMII Reduced Media Independent Interfaces
  • the reduction of the minimum size of the data frames to less than 64 bytes is advantageous, as less the transmission of the first data packet within a frame must be aborted.
  • data packets with a low priority would be transmitted extremely slowly through the automation network, because their data transmission would always be interrupted by data packets with a second priority.
  • each data frame of the first data packet is buffered during the transmission process.
  • the data frame whose transmission was aborted once again transferred to the cache. This happens after the second data packet has been transmitted.
  • Caching the data frames ensures that when the transmission process is interrupted, the data frame whose transmission has been interrupted is not lost. Such a data frame is not received correctly by the receiver. Therefore it has to be transmitted to the receiver again.
  • the transmission of the first data packet and the transmission of the second data packet via a transmission path from the transmitter to the receiver.
  • This transmission path is used exclusively for data transmissions from the transmitter to the receiver in the full duplex method.
  • data packets can be exchanged in both directions between the transmitter and the receiver at the same time, without collisions occurring between the data packets.
  • collisions between data packets that are in opposite Directions are transmitted over the same transmission path, avoided.
  • collisions are avoided even if the minimum size of the data frame is less than 64 bytes.
  • the transmission of the first data packet is interrupted after transmission of a nibble.
  • a nibble consists of 4 bits.
  • the transmission of the first data packet can be aborted after transmission of a complete byte. This may for example be the case with Media Independent Interfaces (MII), where the smallest transferable unit is one byte.
  • MII Media Independent Interfaces
  • the sender immediately forwards a data frame of the data frames of the first and second data packets after a first part of that data frame has been received. This can also be referred to as so-called cut-through switching. This speeds up the forwarding of the data packets, as it does not wait to send to the receiver until the data packet has been completely received by the sender.
  • each of the data frames of the first and second data packets includes a destination address.
  • the destination address determines via which network connection of the transmitter the respective data frame is transmitted to the receiver.
  • the send port of the sender is determined by the destination address.
  • the send port which can also be referred to as a network connection, only the receiver is connected.
  • the second data packet comprises real-time data of the automation network.
  • the real-time data of the automation network must be as possible be forwarded quickly because they are essential for the correct operation of the automation process within the automation network. In particular, by an excessive delay of the real-time data, the automation process may stall or only run erroneously. Therefore, it is advantageous that the second data packet with the higher priority is sent as quickly as possible by the transmitter to the receiver.
  • the invention relates to a transmitter for an Ethernet automation network for the transmission of data packets.
  • the data packets consist of several data frames.
  • a minimum size of the data frames is less than 64 bytes.
  • the transmitter comprises means for receiving a first data packet having a first priority. This can be for example a network connection.
  • the transmitter comprises means for starting a transmission of the first data packet to a receiver.
  • the transmission process can be started by a processor.
  • the first data packet can be sent to the recipient via another network connection, for example.
  • the transmitter comprises means for receiving a second data packet with a second priority.
  • This can be received, for example, via the same network connection as the first data packet or via another network connection.
  • the second priority is higher than the first priority of the first data packet.
  • the second data packet should also be transmitted to the receiver. This may be determined, for example, by a destination address comprising the data packet.
  • the destination address can be read by the processor, for example.
  • the transmitter comprises means for canceling the transmission of the first data packet within one of the data frames of the first data packet.
  • the transmission process is aborted at the data frame which is in the transmission process at the time of the reception of the second data packet.
  • the transmission process of the first data packet is then aborted when the second data packet with the second priority is received.
  • the transmitter also includes means for transmitting the second data packet to the receiver. This can be done, for example, via the same network connection as the transmission of the first data packet.
  • the invention relates to a computer program product having sender-executable instructions that when executed cause the sender to perform a method according to embodiments of the invention.
  • the invention relates to an automation network having at least one transmitter according to embodiments of the invention.
  • FIG. 1 is a schematic view of a data packet 100.
  • the data packet 100 consists of several frames 102-102 '''''. Each data frame 102 has a minimum size of less than 64 bytes.
  • a transmitter such as a network node, a Router, a switch, or a bridge
  • FIG. 1 For example, it is shown that the transmission of the data frame 102 "is aborted at the location 104. An abort of the transmission of the data frame 102" at the location 104 may occur, for example, if sent by the sender sending this data frame 102 "at the moment other data packet ( FIG.
  • the data packet 100 includes user data, such as Internet data, and the other in FIG. 1 Not shown data packet includes important real-time data, which are essential for the automation process of the automation network. If further data packets are to be forwarded to the same receiver, the transmission of the data frame 102 "is aborted without the data frame 102" being completely transmitted to the receiver. Thus, the higher-priority data packet not shown with the real-time data can be forwarded as quickly as possible to the receiver. The aborted data frame 102 "is retransmitted after transmission of the higher priority data packet because it could not be received correctly by the receiver because it was not completely transmitted.
  • Reducing the minimum size of the data frames to less than 64 bytes is also advantageous because it does not require the transfer of a data frame to be terminated as frequently as it does for data frames of a higher minimum size. Thus, even low priority data is reliably transmitted at an acceptable speed. With a larger minimum size of the data frames 102, the transmissions of the low priority data frames 102 would often be aborted because a higher priority data packet needs to be transmitted. In this case, the forwarding of low prioritized data would be significantly delayed.
  • FIG. 2 is a block diagram of a transmitter 200 having a processor 202, a data memory 204, and program instructions 206.
  • the processor 202 is configured to execute the program instructions 206.
  • the transmitter 200 includes network ports 208-208 ". Through the network ports 208-208 ", the transmitter 200 is connected to other components of the automation network. For example, the transmitter 200 may be connected to a receiver via the network connector 208, and to other transmitters 208 'and 208 "with other transmitters, from which the transmitter 200 in turn receives data. In other words, the transmitter 200 is adapted to receive data packets which are received via one of the network ports 208 'or 208 ", via the network port 208 to the receiver.
  • a first data packet having a first priority is received via one of the network ports 208 'or 208 ", whereupon the processor 202 reads out the destination address of the first data packet and starts a transmission of the first data packet to the receiver via the network port 208.
  • a second data packet with a second priority is received via one of the network ports 208 'or 208 ".
  • the second priority is higher than the first priority.
  • the processor 202 also reads out the destination address of the second data packet here.
  • the destination address matches the destination address of the first data packet. In other words, therefore, the second data packet should also be transmitted to the receiver.
  • the priorities are also read out by the processor.
  • the processor 202 By comparing the first priority with the second priority, the processor 202 has information that the forwarding of the second data packet is more important to the automation network than the transmission of the first data packet. Therefore, the transmission process of the first data packet within one of the data frames of the first data packet is aborted. The abort occurs at the data frame which is in the transmission process at the time of the reception of the second data packet. It will be the second as soon as possible Data packet sent to the receiver. This reduces the delay time for high priority data such as real time data. After termination of the transmission process of the first data packet, the second data packet is transmitted to the receiver via the network connection 208. If the transmission of the second data packet has taken place, the transmission process of the first data packet can be resumed.
  • the aborted data frame is retransmitted because it could not previously be received correctly by the receiver.
  • the first data packet including the aborted data frame can for example be stored in the data memory 204 or in another data memory. Either the whole data package can be saved or even only a part. For example, a data frame of the first data packet can be deleted if it has been completely transmitted. Thus, only data frames of the first data packet, which have not yet been completely transmitted to the receiver, are located in the data memory.
  • FIG. 3 is a flowchart of a method according to embodiments of the invention.
  • a first step S1 the first data packet with the first priority is received by the transmitter.
  • step S2 the transmission of the first data packet from the transmitter to the receiver is started. This transmission continues during step S3.
  • step S3 the second data packet with the second priority is received by the transmitter at a time, while the transmission of the first data packet is still running. The second priority is higher than the first priority and the second data packet is also to be transmitted to the same receiver as the first data packet.
  • step S4 the transmission process of the first data packet within one of the data frames of the first data packet is aborted.
  • the transmission of the data frame is aborted, which is at the time of receiving the second data packet in the transmission process.
  • the transmission process is thus aborted as soon as possible. It will not Waited until a data frame is completely transferred.
  • step S5 the second data packet is transmitted from the sender to the receiver.
  • the transmission of the first data packet can be continued when the transmission of the second data packet is completed.
  • the aborted data frame is transmitted repeatedly because it could not previously be received correctly by the receiver.
  • the first data packet is buffered during the transmission process of the second data packet in the transmitter.
  • the entire first data packet can be buffered or only the part of the first data packet that has not yet been completely transmitted to the receiver.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
EP11170979.6A 2011-06-22 2011-06-22 Procédé destiné à la transmission de paquets de données Not-in-force EP2538619B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES11170979.6T ES2445718T3 (es) 2011-06-22 2011-06-22 Procedimiento para la transmisión de paquetes de datos
EP11170979.6A EP2538619B1 (fr) 2011-06-22 2011-06-22 Procédé destiné à la transmission de paquets de données
US13/528,611 US20120327950A1 (en) 2011-06-22 2012-06-20 Method for Transmitting Data Packets
CN2012102138341A CN102843288A (zh) 2011-06-22 2012-06-25 用于传输数据包的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11170979.6A EP2538619B1 (fr) 2011-06-22 2011-06-22 Procédé destiné à la transmission de paquets de données

Publications (2)

Publication Number Publication Date
EP2538619A1 true EP2538619A1 (fr) 2012-12-26
EP2538619B1 EP2538619B1 (fr) 2013-12-18

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US (1) US20120327950A1 (fr)
EP (1) EP2538619B1 (fr)
CN (1) CN102843288A (fr)
ES (1) ES2445718T3 (fr)

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EP3226484A1 (fr) 2016-03-31 2017-10-04 Siemens Aktiengesellschaft Procede destine a la transmission de donnees dans un reseau de communication d'un systeme d'automatisation industriel et appareil de communication
EP3715983A1 (fr) 2019-03-28 2020-09-30 Siemens Aktiengesellschaft Procédé de fourniture des applications de commande à l'aide d'un réseau de communication destiné à la transmission des données temporellement critiques et dispositif de coordination

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WO2015162734A1 (fr) * 2014-04-23 2015-10-29 三菱電機株式会社 Dispositif relais et procédé de transfert de données
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EP3715983A1 (fr) 2019-03-28 2020-09-30 Siemens Aktiengesellschaft Procédé de fourniture des applications de commande à l'aide d'un réseau de communication destiné à la transmission des données temporellement critiques et dispositif de coordination
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US20120327950A1 (en) 2012-12-27
EP2538619B1 (fr) 2013-12-18
ES2445718T3 (es) 2014-03-04
CN102843288A (zh) 2012-12-26

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